The pair’s rocky relationship has been the subject of many episodes of the Bravo show this season, and three and a half weeks ago, they called it quits after being engaged for five years.

But Krupa came to The Post’s Midtown office today wearing her enormous engagement ring and says that, as of two days ago, the engagement is back on.

“The thing that got us back together was my mom,” Krupa says. “My mom saw how much I was hurting. I needed the Joanna time but I was calling her crying from Skype.

“She said, ‘You are in too much pain. You guys need to work s–t out.’

“I kinda wanted to prove a point to him that he got away too easy with the e-mails, and I don’t want it to happen again.”

Zago and Krupa are seen fighting on “Real Housewives” over e-mails he sent to another woman.

Krupa also blames a failed work project for tension in the relationship.

“In the last year, there was a project I was working on that fell through. I was working on it for over a year and a half. It would have been one of the biggest things in my life, and it fell through and that totally affected the relationship. I didn’t really want to go to Miami or to see him, I was just in my own zone. That would’ve broken us up if we didn’t have this strong love for each other.”

But now the couple is looking ahead to a wedding in 2013 or 2014 in Positana, Italy. And after being broken up for Thanksgiving, they plan to spend the holidays together in Vail, Co.

In other “Housewives” relationship news, Karent Sierra told The Post she has broken up with her telenovela-star boyfriend Rodolfo Jimenez.

“I think love is blind, and as much as our friends and family want to guide us and say, ‘Open up your eyes,’ I think that you need to be ready within yourself,” she says.

“I finally took the blinders off and stopped seeing things through rose-colored glasses. When I started seeing him played back on TV, I was seeing what other people were seeing — his reaction to me particularly — I was like, ‘Oh gosh, I really don’t like him!'”